I was started Goal Optimized Shopping Campaign Aka (Universal Shopping Campaign) but when I'm trying to adjust device bids I found that this action is not supported in Goal Optimized Shopping Campaign which is the biggest drawback of this new type of shopping campaign.

Why..?

Ans: my site gives me best result in Desktop's but in this feature, I get only 16% Traffic which is a big loss for me kindly do share some solutions if found. (http://prntscr.com/juch6h)